AjaxSearch - "as.publishedon" shows creation date, not publishing date!

AjaxSearch - "as.publishedon" shows creation date, not publishing date! That is,
in fact, the problem. Any ideas? I wanted to create a result page with AjaxSearch,
and on that result page, there should appear the publishing date of every article
listed. I used the "as.publishedon" variable. But what this variable really shows,
is the creation date, not the publishing date! Is there any possibility to change
that? I hope for some development...

bests,
spoony.